The ProFlex™ dryer duct is ideal for both gas and electric clothes dryer applications.  This duct is UL2158A listed and marked for safe dryer venting and is constructed of heavy duty, fire resistant, 4 ply aluminum foil laminate that encapsulates a high density, corrosion resistant wire helix.  This forms an air tight and easy to use air duct.  This duct will not support combustion. Note: Per UL2158A only ducts 8’ or less can be UL marked